A force based touch interface device comprising a touch substrate, a torsion preventing structure for preventing torsion of the touch substrate by an externally-applied force touch, a plurality of sensors for measuring the force touch applied to the touch substrate at different positions, an input device for applying the force touch onto the touch substrate, and a controller for measuring force data using the plurality of sensors when the force touch is applied onto the touch substrate, for estimating force data for symmetrical points for touch points to which the force touch is applied using the measured force data, and for comparing the measured force data and the estimated force data with ideal force data to generate a calibration matrix for correcting a process error.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A force based touch interface device comprising: a touch substrate; a torsion preventing structure disposed under the touch substrate and configured to prevent torsion of the touch substrate by an externally-applied force touch; a plurality of sensors disposed at different positions for measuring the force touch applied to the touch substrate, wherein at least two of the plurality of sensors are disposed to be symmetrical with each other relative to a line passing through a center of gravity of the touch substrate; an input device for applying the force touch onto the touch substrate; and a controller for: measuring first force data using at least one of the plurality of sensors when the force touch is applied to at least one first point on the touch substrate, estimating second force data for a second point, which is symmetrical with the at least one first point relative to the line passing through the center of gravity of the touch substrate, using the first force data, and generating a calibration matrix by comparing the first force data and the second, force data with ideal force data, wherein the controller compares the first and second force data with the ideal force data to calculate a relationship between the first and second force data and the ideal force data, and calculates calibration parameters from the calculated relationship to generate the calibration matrix.
2. The force based touch interface device according to claim wherein the torsion preventing structure includes: an edge frame arranged to correspond to the touch substrate, and a plurality of ribs disposed inside of the edge frame.
3. The force based touch interface device according to claim 1 , wherein the torsion preventing structure includes a plurality of bars connected to one another to support a touch surface.
4. The force based touch interface device according to claim 1 , wherein the plurality of sensors include any one of a strain gauge, a force sensitive resistor (FSR) and a capacitive sensor.
5. The force based touch interface device according to claim wherein a number of first point is determined according to a number of sensors.
6. The force based touch interface device according to claim 1 , wherein a manufacturing error is an error caused by a misalignment of the respective sensors.
7. The force based touch interface device according to claim 1 , wherein the controller corrects the first force data using the calibration matrix, and calculates a touch position to which the force touch is applied by applying the corrected force data to a force moment equilibrium equation.
8. A method for correcting a force based touch interface device including a torsion preventing structure disposed under the touch substrate and configured to prevent torsion of a touch substrate, the method comprising: collecting first force data using at least one of a plurality of sensors disposed at different positions when a force touch is applied to at least one first point on the touch substrate, wherein at least two of the plurality of sensors are disposed to be symmetrical with each other relative to a line passing through a center of gravity of the touch substrate; estimating second force data for a second point, which is symmetrical with the at least one first point relative to the line passing through the center of gravity of the touch substrate, based on the first force data; and generating a calibration matrix for correcting a manufacturing error by comparing the first force data and the second force data with ideal force data, wherein in the generating a calibration matrix, the first force data and the second force data are compared with the ideal force data to calculate a relationship between the first and second force data and the ideal force data, and wherein calibration parameters are calculated from the calculated relationship to generate the calibration matrix.
9. The method according to claim 8 , further comprising, before the collecting the first force data, defining a number of first point, positions thereof, touch strengths thereof and a touch order thereof.
10. The method according to claim 9 , wherein the number of touch points is n/2 or more when the number n of sensors is an even number.
11. The method according to claim 9 , wherein the number of touch points is (n+1)/2 or more when the number n of sensors is an odd number.
12. The method according to claim 8 , further comprising, after the generating the calibration matrix: correcting the process error included in the first force data using the calibration matrix; and calculating a touch position using the corrected force data.
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December 1, 2016
March 31, 2020
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